public class Main extends Stu {
    {
        System.out.println(1234);
    }
    public Main()
    {//super();

        System.out.println(123);
    }
    public static void main(String[] args) {
//        Stu stu=new Stu();
        //Main main=new Main();
//        s();
    }
}
class Stu{
    public void s(){
        System.out.println(12);
    }

    {
        System.out.println("实例块");
    }
    static {
        System.out.println("静态块");
    }
}